Electrsc transformer



(No Model.)

B. THOMSON.

ELECTRIC TRANSFORMER.

Paten J L I WITNESSES:

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ZRRM

ATTORNEY.

UNITED STATns PATENT rricE.

ELIHU' THOMSON, OF LYNN, MASSACHUSETTS, ASSIGNOR TO THE THOMSON- IIOUSTON ELECTRIC CQBTPANY, OF CONNECTICUT.

ELECTREC TRANSFORMER.

SPECIFICATION forming part of Letters Patent No. 581,873, dated May 4, 1897. Application filed January 29,1890. Serial No. 338,525. (No modelfl T ctZZ whom it may concern: clamping plates and bolts or by other meahs Be it known that I, ELII-IU THOMSON, aciLiwhich may be varied indefinitely.

Zen of the United States, and a resident of Figure 1 shows in side elevation a form of Lynn, in the county of Essex and State of electric coil and iron cores or magnetic cir- Massachusetts, have invented certain new cuit therefor to which my invention is apand useful Transformers, of which the folplicable. Fig. 2 shows an F -shaped blank lowing is a specification. which may be used, as shown in Fig. 3, in

My present invention relates to transformbuilding up a core of the form shown in Fig. ers, self-inductive coils, and other similar 1. Figs. 3 to 15 show various modifications 10 forms of electromagnet in which there is a in the shape or proportion of the F-picces and practically closed or endless magnetic circuit the manner-of assembling them or combining of iron formed through the axis of the coilthem with other pieces to make the iron core. and around the outside thereof by amass of The F-pieces, Fig. 2, may be combined, as iron laminae or sheet-iron plates. shown in Fig. 3, so that the lines of junction I 5 My invention applies not only to cases or abutment between the plates in the two where the iron mass is continuous, but to bundles will be,as at a a. a, horizontal or parcases where there is a break, provided such allel to the plane of winding. The plates break is insufficient to permit the coil to be may be applied singly and afterward bolted slipped into place after winding, or, in other together, or two bundles may be first con- 20 Words, the form of the iron core or circuit is strueted and then slipped into place. Clampsuch as to provide an opening or openings ing plates and bolts, as indicated atE D, may through which the coils would hay e to be hold the structure intact after completion. threaded if the core were constructed first It will thus be seen that very great ease of and independent of the coils. application is secured, since these pieces may 25 The object of my invention is to facilitate be readily applied to any helix or coil previthe construction of such apparatus by perously wound on a frame which fills, or nearly mitting the electric coil or coils to be sepafills, the space left at C C in the figure. rately constructed and the iron mass forming Fig. 4. shows a slightly modified form which, the closed or endless magnetic circuit to be when two pieces are employed or clamped to- 30 afterward applied to the coil or coils. gether, gives the compound piece or pile, Fig.

My invention is especially applicable to 5, which differs from Fig. 3, already shown those cases where the core or iron mass has in the direction of some of the lines of junctwo openings or spaces in which opposite tion relatively to one another. sides of the coil or coils lie; and it consists, Fig. ii shows another modification which 35 essentially, in building up the core from F- differs from that shown in Fig. 3 simply in shaped sheet-iron plates assembled as hereinthe relation of the middle prong-piece of the fterdescribed and properly secured together half form, as will be seen on inspection.

in position. Fig. 7 is a form differing only from Fig. 5

My invention consists also of an F-shaped in the relation of the middle pieces of the F- 40 sheet-iron blank or plate for use in building figures composing the plate. up the iron core or closed magnetic circuit. Fig. 8 shows the magnetic circuit made up Two F shaped plates, or two sets of F-shaped by an upper F-shaped piece and a lower L- plates, may be used, or the F shape may be shaped piece placed adjacent thereto, the conveniently used with other forms, as will F-shaped figure being marked F and the L- 45 hereinafter appear. The plates or laminae shaped pieces in the 'Iigure being marked L. 5 lying against or upon one another are bolted These separate pieces of metal are cut out or or secured together in any desired way, as punched to shape and applied thereon in bunwell understood in the art, and the whole core dies or successively one after the other in structure, after being built up in and around forming the core.

50 the coil or coils, is secured in position by Fig. Oshowsa similararrangement in which the forms of the F-shaped piece are somewhat distorted or changed.

In Fig. 10 a piece somewhat similar to Fig. 8 is slightly modified,and there is an F-shaped piece and an L-shaped piece matched.

In Fig. 11 a still further modified form is seen in which two F-shaped pieces are fitted together, the central prong or projection being made in a form as indicated, so as to give an interlocking fit.

In Fig. 12 the arrangement is modified, so that the upper F-shaped piece to the left fits into a larger or longer F-shaped piece to the right, and the pieces are marked, respectively, F F.

Fig. 13 shows that Fig. 10 may be virtually composed of two F-shaped matched pieces not differing greatly from the arrangement Fig. 5, except that the middle division between the F-shaped pieces is put horizontal instead of remaining vertical, as in the case in Fig. 5.

In Fig. 14: the lF-shaped pieces are shown with beveled outlines at their meeting-points and locked together in the position shown in the figure, the lines which join the corners of the figures being made in a direction diagonal thereto and those which join the portion of the figure at the center being made in a direct-ion oppositely.

In building up a core of any of the forms of pieces indicated the corresponding pieces may be built up in a pile or block and bolted together with insulation between the coils put thereon and the remaining piece placed on as a facing and the whole bolted together in a suitable frame or in any other way secured in position, or, as indicated in Fig. 15, the lamime may be built up separately and applied separately to the coils, the said figure indicating a reversed position of alternating lamina or alternate sets of laminae, the general form of each of which corresponds to that of Fig. 3. When the successive layers are thus reversed, their arms or limbs will overlap and break joints, as shown. In this way the lamina of different planes may be made to break joint one with the other, so that the continuous portions of the plates in one plane will lie opposite or against the junctions of laminae in other planes.

\Vhat I claim as my invention is 1. In an iron-clad transformer, the laminated iron envelop having its laminae made each of two sheet-iron punchings fitting together from opposite sides of the coils, and each having a middle limb entering within the coils and the two punehings having arms at each side of the central limb which meet each other out of coincidence with the middle of the coils, and with successive laminze reversed so that by the unequal length of their limbs they shall break joints.

2. In an iron-clad transformer, the laminated iron envelop having its laminae made each of two sheet-iron punchings fitting together from opposite sides of the coils, and

each having a middle limb entering within the coils and the two punchings having their relatively-aimtting limbs of unequal length at the points where they abut, so as to meet each other out of coincidence with the middle of the coils, and with successive lamina reversed so that by the unequal length of their limbs they shall break joints.

An iron-clad transformer, the laminated envelop of which is built up of lamime made each of two sheet-iron punchings fitting together from opposite sides of the coils, each punching having a middle limb entering within the coils, their middle limbs being of unequal lengthen opposite sides of the axial plane of the coils, and with successive lamime reversed to break joints.

4. In an iron-clad transformer, the lami nated iron envelop built up of like sheet-iron punchin gs fittin g together from opposite sides of the coils, said punchings having each a middle limb entering within the coils and having their limbs of unequal length on opposite sides of the axial plane of the coils, with successive laminae reversed to bring the limbs of unequal length into juxtaposition, whereby the superposed punehings overlap to the extent of the inequality in length of their limbs.

5. A magnetic frame for an ind uctorium or converter, formed of two separable sections which together compose a frame built up of plates or layers, each plate or layer consisting of two elements, one for each of said sections, being placed together so as to form a symmetrical closed frame with a cross-strip formed of the middle limbs or projections from the plates to constitute a core, adjacent layers or groups being reversed so as to break joints and form overlapping and interlockin portions between the two sections.

6. A magnetic frame for an inductorium or converter, formed of two separable sections, which together compose a frame built up of plates or layers, each plate or layer consisting of two elements, one for each of said sections, being placed together so as to form a symmetrical closed frame with a cross-strip to constitute a core, adjacent layers or groups being reversed so as to break join and form overlapping and interlocking portions between the two sections, means for holding the elements of each section together, and means for holding the two sections against separation from one another.

7 A core for transformers composed of laminze having an F shape reversed with respect to one another and facing in opposite directions so as to produce a rectangular figure in which the central opening is divided equally by the shorter limbs of the lF-shaped pieces for the reception of the transformercoil.

S. A laminated core for a transformer each lamina composed of two pieces of sheet-iron approximating in shape the letter or its equivalent as described, and having, there- IIO fore, a portion extending at right angles to another portion, said pieces being placed face to face so as to form a rectangular figure with a break at the opposite ends of a diagonal, and having extensions or projections in the middle of one or both pieces to form the central bridge surrounded by the coils of the transformer.

9. A core for transformers composed of sheet-iron laminae, each lamina composed of two pieces approximating in shape the letter F, or its equivalent as described and having a portion extending at right angles to another portion, said pieces being placed face to face so as to form a rectangular figure with a ELIHU THOMSON.

Witnesses:

JOHN W. GIBBONEY, ALBERT L. ROHRER. 

